There is a long history of viral connection from EBV, HH6 Coxsakie B to name but a few that have troubled compromised immune systems. Treatment of HH6 simmaronresearch.com/2013/0... with Cidofovir has now used Brincidofovir

chimerix.com/discovery-clin... a powerful treatment that has wide ranging success with kidney damage a possible side effect requiring constant monitoring.